Trisazo dyestuff and the process of manufacture



, combinin Patented Jan. 25, 1927.

UNITED STATES PATENT OFFICE.-

JOSEPH-1B. OESGH, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO THE NEWPORT COM- PANY, OF GARROLLVILLE, WISCONSIN, A CORPORATION OF DELAWARE.

TBISAZO DY ESTUFF AND THE PROCESS OF MANUFACTURE.

No Drawing.

This invention relates to trisazo dyes capable of dyeing unmordante'd cotton orange to brown shades of great fastness to light. The new. dyes are derived from acetylamino twomoleoular proportions of The process of manufacture consists in the diazotized acetylamino Cloves acid l-acetylamino 4 naphthylamine 6 sulfonic acid, or 1 acetylamino 4 naphthylamine 7 sulfonic acid, or a mixture of both) with m-t0luidine,. diazotizing the intermediate dye thus obtained, combining it with m-toluidine, diazotizing the resulting disazo dyestufi', and combining the latter with phenylmethylpyrazolone or a substitution product thereof.

' Without limiting my invention to any particular procedure, the following example in which parts by weight are given illustrates the application of my invention in the pre-- ferred form:

28' parts of acetylamino Cleves acid (1 acetylamino 1 naphthylamine 6 sulfonic acid, or 1 acetylamino 4 naphthylamine 7 sulfonic acid, or a mixture of both) dissolvedin 300 parts of'water, is cooled to 0 C. and

acidulated with 35 parts of hydrochloric acid, sp. gr. 1.163, and diazotized' with 6.9-

parts of sodium nitrite. The diazo com: pound is then added to a solution of 11.3 parts of m-toluidine and 11.6 parts of hydrochloric acid in 100 parts of water. The mixture is stirred for a short time and a solu- Application m February a, 1926. Serial No. 86,655.

molecular proportionvof an end component consistin of phenylmethylpyrazolone orits substitution products. 4

These new dyes correspond to the general formula tion of 25 parts of sodium acetate is slowly added and .stirred until the copulation is with 6.9 parts of sodium nitrite. The mixture is stirred until the nitrous acid has disappeared. The diazo compound thus,ob tained is added to a s0lut-i'on made up of 11.3 parts of m-toluidinerand -l'lfi parts of hydrochloric acid in 100 parts "of water. This is then stirred for aquarter of an hour and 25 parts of sodium" acetate are slowly added. The mixture is again stirred until the copulation is complete. The amino disazo dyest-ufi is then acidulated with 35 parts of hydrochloric acid and further diazotized with .7 parts of nitriteand the mixture stirred until diazotization is complete. The diazo compound is then added to a solution of 27.9 parts of phenylmethylpyrazolone sulfonic acid sodium salt, 160 parts of water, and 95A: parts of soda ash. Agitation is continued for six hours, the solution is heated and salted, filtered and the filter cake dried. The new dye corresponds to the 'following formula:

After being dried and pulverized, in the state of its sodium salt, the dye is a dark powder easily soluble in water with an orange brown coloration. -It dyes cotton in orange brown shades, very fast to light.

The sodium salts of this fclass of: dyes are in general soluble in water to orange brown solutions, the color of the solutions changing with caustic soda to reddish brown.

NHCOCH;

1-acetylamino-4-zimino-naphthalene-e-sullonic-acid (sodium salt) With hydrochloric acid the dyes are part- 1 1y separated as brown precipitates. The dye powders are insoluble in ether and benzene and partly soluble in alcohol to give orange brown solutions.

Strong reducing agents split up the 15 trisazo structure, as indicated, to give in the case of the specific dye of the above example the following reduction products:

2 molecules methyl-p-phenylene-diamine HI l-p-sultophenyl-a-methyH-amino-5-pyrazolone I am aware that numerous details of the.

process may be varied through a wide range without departing from the spirit of this invention, and I. do not desire limiting the patent granted other than as necessitated by the prior art NHCOGHI this dye being in the shape of its sodium salt a dark powder soluble in water to an orange-brown solution, the color of the solution changing with caustic soda to a red- 35 dish brown; with hydrochloric acid the dye is separatedout as a brown ,flocculent precipitate; said powder being insoluble in NHCOOH:

3. The method of pf I claim as my invention! 25 1. As a new article of manufacture a trisazo dye as herein descrlbed, having most probably the following formula:

organic solvents such as ether, partly soluble in benzene and alcohol, being destroyed by strong reducing agents and the dyeings on 4 cotton being orange to brown.

2. As a new article of manufacture a trisazo dye as herein described having most probably the following formula:

which consists in combining acetylamino 4. Materials dyed with the dye, described Cleves acid with m-toluidine, diazotizin in claim 1. the intermediate compound thus obtaine 5. Materials dyed with the dye, described 10 oombin'ing it with m-toluidine, diazotizing in claim 2. I '5 the disazo compound, and combining the In testimony whereof I have hereunto last mentioned compound with phenylsubscribed my name.

lnethylpyiazclone. JOSEPH B. OESCH. 

